Sight for firearms.



Hurrah srArEs PArRNT orrion'.

SIGHT son FIREAR'MS.

Speccation of Letters Patent.

Patented Sept. 4, 1906.

Application filed July 31.1905- Serial No. 272.107.

Firearms; and I do hereby declare that the following is a full, clear, and eXact description thereof, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and gures of reference marked thereon, which form part of this specification.

rIhe object of my invention is to provide an adjustable front sight for firearms, and particularly rifles, which sight is simple in construction, easy to manufacture and adjust, and which is free from objection on account of the adjustable features.

In the drawings, Figure l shows a side elevation of a portion of a firearm-barrel with my sight mounted thereon, all shown on a larger scale than full-sized. Fig. 2 shows in a similar manner a front view of the sight, together with a cross-section of the firearmbarrel. In this figure the sight is adjusted to substantially its lowest position. Fig. 3 shows a similar view to Fig. 2, in which the sight is adjusted to substantially its highest position. Fig. I is a side elevation of the sight-blade removed from the base part. Fig. 5 is a perspective view of the sight removed from the barrel. Fig. 6 shows, partially in section on line corresponding with C D of Fig. 7, a modified form of construction. Fig. 7 showsl a section on lineAB of Fig. 6 a crosssection of the same modified form of construction. Fig. 8 shows in side elevation the sight applied to that class of firearm-barrels which have a rib on top of the barrel, integral with the barrel or secured thereon. Fig. 9 shows a section on line E F of Fig. 8.

Referring to the reference letters and gures in a more particular description, l indicates the sight-base, which ordinarily will be provided with a dovetailed downwardly-extending projection or part la, adapted to engage in a transverse -dovetail slot in the top of the barrel A. This particular mode of attaching to the barrel, however, is not material. The base l is provided with two upwardly-standing parallel walls a b, provided therebetween with a vertical longitudinal slot adapted to receive the sightblade c. The inner face of the wall a is provided with longitudinal grooves and ribs preferably made as j ment.

fine and close together as conveniently possible, while the adjacent wall of the blade c is provided with a similar set of grooves and ribs, the two sets being adapted to intermesh as shown.

Extending between the walls a and b is a holding and binding screw d, which will be screw-threaded into the wall a and the head of which will engage against the wall Z). The sight-blade c is provided with a vertical slot d, through which the screw passes and which will prevent longitudinal movement of the sight-blade in the base when the screw is in position. The top edge of the sight-blade will preferably be provided with a substantially cylindrical head c2, on the end of whichA may be arranged a bead c, if desired. Of course it will be understood that the effective part of the sight is the head c2, with its bead, if used, and the point to be attained is to adjust this head toward or from the barrel, as desired. In order to accomplish this, the screw d is removed, when the sight-blade can be displaced by sliding it out of the base longitudinally in either direction. placed in a higher or lower position, as desired, the grooves and ribs of the wall a being adapted to engage with the grooves and ribs, or a portion thereof, of the sight-blade at any point within the limits of its vertical adj ust- When adjusted to the right height, the screw d is replaced and prevents longitudinal movement of the blade in the baseand when tightened up binds the walls a and b against the sides of the blade, securing it firmly. Inorder to allow sufficient elastic ity, adjacent to the base of the wall a there is provided a saw-cut fc, which weakens Ythe material sufficiently to allow the wall to spring more readily under the influence of the screw, and a similar cut can be provided at the base of the Wall if desired. rIhe finer the grooves `or corrugations on the face of the wall a and the sides of the blade c are made the finer the adjustments of the sight that may be secured, and, as before suggested, these are preferably made as fine as they can be made conveniently and still have sufficient holding power. It is also obvious that corrugations or grooves can be provided on the inner face of the wall b and on both faces of the blade c, if preferred. When the screw d is tightened, the blade will be held as rigidly and accurately as though it were permanently attached to the base, and even when the screw is not tightened if the sight is made with accuracy It is then re- AI oo IIO the blade will still be held sufiiciently and held against longitudinal displacement in the slot. Interchangeable blades with different beads or heads and being of the classes of target and hunting sights, as commonly known, may be provided and substituted in the base from time to time as desired without disturbing the sighting ofthe firearm.

In the modified form of construction shown in Figs. 6 and 7 a base 2, somewhat similar in construction to that of the previously-described form, is provided, except that it will be relatively longer than the sight-blade. The inner face of the wall 2a of this construction will be grooved or corrugated, as before explained, except that the corrugations will run at an angle, preferably of about fortyiive degrees, with reference to the plane of the base instead of longitudinally or parallel with the base, as in the previously-described construction. form of construction is adapted to fit between the walls 2L and 2b and on the side toward the wall 2 will be provided with inclined grooves or corrugations adapted to engage those of the Wall 2a. The holding or securing screw 4 passes through the walls 2a and 2b and is screw-threaded into the latter and has its head resting against the former. This screw also passes through the inclined slot 5 in the sight-blade, which slot is so arranged as to permit the relative movements of the blade and base and prevent the blade becoming accidentally displaced. :When the screw 4 is loosened, the sight-blade may be moved upwardly and downwardly and somewhat forwardly and backwardly, following the angle of the grooves, until its proper position of adjustment is attained, when it will be secured in position by tightening the screw 4.

The highest position of adjustment permitvted in the construction, as shown in Figs. 6

and 7, is shown in dotted lines in those two figures. It will be apparent thatboth sides of the blade 3 may be corrugated and the inner face of the wall 2b also grooved or corrugated, as suggested with reference to the other construction. The number and iineness of the grooves and corrugations emloyed in this modiiied form of construction 1s not important. l Figs. 8 and 9 show a sight substantially of the construction of Figs. l to 5 applied to that class of barrels which have a top rib formed integral therewith or applied thereto. In such case the top rib 5 is slotted longitudinally from the end to receive the sightblade 6 of the form of construction shown in Fig. 4, and the rib becomes, in effect, the sight-base. The blade is held and clamped The blade 2 of this modified` stopte in position, same as in Figs. l to 5, by screw 7, and the blade is removed and replaced in making the adjustment same as in Figs. 1 to 5, inclusive.

Other modications and changes may be made without departing from the spirit of my invention.

What I claim as new, and desire to secure by Letters Patent, is-

l. The combination in a sight for firearms of a base adapted to be a part of or secured to the barrel thereof, having a longitudinallyarranged slot having a grooved Wall, a sightblade fitting in said slot and engaging in said grooves, and means for clam ing said walls against the blade, substantial y as set forth.

2. The combination in a sight for firearms of a'base, having a slot arranged longitudinally of the barrel and open at the top, at least one of the walls of said grooves being longitudinally grooved, a removable blade fitting said slot and grooves, and having a transverse passage for a holding-screw, and a holding-screw, substantially as set forth.

3. The combination in a sight for iirearms of a base having an upwardly-opening longitudinal slot' between two adjacent walls, ribs or grooves provided on the inner face of at least one of said walls, a vertically-adjustable blade iitting in the slot and a transverse pin or screw passing through the walls of the body, and a' slotted opening in the blade, substantially as set forth.

4. The combination in a sight of a base having a longitudinal upwardly-opening groove between two parallel walls, one of which is capable of yielding, a removable blade adapted to be received in said slot, the contacting surfaces of the base-wall and blade being grooved or corrugated for definite degrees of adjustment, and a transverse pin passing through the walls and through a slotted opening in the blade, substantially as set forth.

5. The combination in a sight for firearms of a base having an upwardly-projecting wall having longitudinal grooves or corrugations on its face, an adjustable blade having corresponding longitudinal grooves or corrugations on its base portion adapted to it those of the wall, and means for binding the blade against the corrugated face of the wall, substantially as set forth.

In witness whereof I have affixed my signature, in presence of two witnesses, this 24th day of July, 1905.

FRANCIS CARROLL CHADWICK.

Witnesses:

S. I. DEVINE, EMMA S. HEssE.

ICO

IIO 

